Biopsy cannula



FIG. 1 is an elevational view of a biopsy cannula showing my new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is an end elevational view thereof, as seen from the distal end of FIG. 1;

FIG. 4 is an end elevational view thereof, as seen from the proximal end of FIG. 1; and

FIG. 5 is a cross-sectional view taken along line 5--5 of FIG. 1. 

The ornamental design for a biopsy cannula, as shown. 